1. Where in the Galaxy is the solar system located? a. in the nucleus, b. inthe halo, c. in a spiral...

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1. Where in the Galaxy is the solar system located? a. in the nucleus, b. inthe halo, c. in a spiral arm, d. between two spiral arms) e. in the centralbulge13. What evidence indicates that a supermassive black hole is located at thecenter of our Galaxy?CHAPTER 162. Spiral density waves are directly responsible for which of the following?a. flocculent spirals, b. grand-design spirals, c. supernovae, d. the collisionsbetween galaxies, e. galactic cannibalism18. Some galaxies in the Local Group exhibit blue-shifted spectral lines.Why are these blue-shifts not violations of the Hubble law?CHAPTER 173. Suppose you suspected a certain object in the sky to be a quasar. Whatsort of observations would you perform to confirm your hypothesis?      
	
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CHAPTER	  15	  
1. Where in the Galaxy is the solar system located? a. in the nucleus, b. in 
the halo, c. in a spiral arm, d. between two spiral arms) e. in the central 
bulge 
13. What evidence indicates that a supermassive black hole is located at the 
center of our Galaxy? 
CHAPTER 16 
2. Spiral density waves are directly responsible for which of the following? 
a. flocculent spirals, b. grand-design spirals, c. supernovae, d. the collisions 
between galaxies, e. galactic cannibalism 
18. Some galaxies in the Local Group exhibit blue-shifted spectral lines. 
Why are these blue-shifts not violations of the Hubble law? 
CHAPTER 17 
3. Suppose you suspected a certain object in the sky to be a quasar. What 
sort of observations would you perform to confirm your hypothesis?CHAPTER 18 
1. Which force in nature is believed to have formed second? a. gravity, b. 
electromagnetic force, c. weak force, d. strong force, e. all formed at the 
same time 
4.  Explain the difference between a Doppler redshift and a cosmological 
redshift. 
6. Assuming that the universe will expand forever, what will eventually 
become of the microwave background radiation? 
CHAPTER 19 
1. Which stellar spectral type is most likely to have a planet on which 
advanced life exists? a. O, b. B, c. A, d. G, e. M

Robert · Accepted Answer

Chapter 15
Answer 
If we look at the images of various galaxies obtained then it is clearly visible that the solar system is 
located between two spiral arms. So the answer will be d.
References: 
Neil F Comins, W. J. (2008). The Milky Way Galaxy. In W. J. Neil F Comins, Discovering the Universe 
Eight Edition (p. 434). W.H Freeman and Company.
Answer 
There is various evidence available that a massive Black hole is present at the center of our 
Galaxy. Infrared observations conducted in the light coming from stars present near the center of 
the galaxy reveals that the gases and heavenly bodies are rotating at a very rapid rate near the 
center of the galaxy. If the movement of these bodies is rapid that means something which is 
super massive is holding the whole system together and is able to provide the required 
Gravitational force. It was further calculated that this is possible only the mass of the object 
located at the center is around 4 x 106 times Chandrasekhar limit. 
References: 
Neil F Comins, W. J. (2008). The Milky Way Galaxy. In W. J. Neil F Comins, Discovering the Universe 
Eight Edition (p. 444). W.H Freeman and Company.
Chapter 16
Answer 
Spiral density waves are responsible for Grand Design Spirals. So the answer to the Question is b.
References: 
Neil F Comins, W. J. (2008). Galaxies. In W. J. Neil F Comins, Discovering the Universe Eight Edition 
(p. 454). W.H Freeman and Company.
Answer 
Galaxies in the local group are also called as super cluster galaxies. Gravity is the most important 
factor in super cluster galaxies or Local group Galaxies.

1. Where in the Galaxy is the solar system located? a. in the nucleus, b. in the halo, c. in a spiral arm, d. between two spiral arms) e. in the central bulge 13. What evidence indicates that a...

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